Question

Efectueaza utilizând factorul comun.
c)5+10+15+20+25+30+35;
d)6+12+18 +24+30+36+42

Answer 1

5·(1+2+3+4+5+6+7)=140
5·28= 140
6·(1+2+3+5+6+7)=168
6·28= 168

Answer 2

c)5+10=15+15=30+20=50+25=75+35=110+30=140

d)6+24=30+(18+12)=30+30=60+36=86+42=118